Transparency Measurement
CL-100 Transparency / Clarity Meter
Zebedee Corp.
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Transparency Measurement
The distinction between haze, the loss of contrast, and transparency / clarity, the loss of resolution (distinctness of image / DOI), is now widely accepted. These differences can be easily seen by holding a sample in front of ones eye and observing an image. If the Image is foggy that is Haze but if the image is not sharp that is Transparency Measuement as in ASTM-D1746. In this method an old Transparency / Clarity Meter is compaired to the new Transparency / Carity Meter and some confusion has occurred because the name is similar to a present day company that manufactures a Haze Type Instrument. Subsequent studies have used different techniques and terminology for the perceived loss of resolution, and the terms see-through clarity, transparency measrement, clarity, and see-through are often used to describe this effect.The point of agreement among all of these authors is that the receptor aperture must be very small to retain the correlation between the instrumental results and human perception, as originally found by Webber. Using a high resolution photogoniometer constructed by Aughey and Baum, Webber showed that the direct transmittance or Transparency Measurement / clarity, of the films correlated well with rankings of film quality performed by human observers, provided that the cutoff angle at the receiving aperture was very small. Correlations between perceived quality and transparency were lost if the acceptance angle exceeded 0.1 degree. No Haze Type Instruments can measure Transparency / Clarity because they detect light scattered in the angular range of 1.4–4.0 degrees.

The only commercially available Transparency / Clarity meter in compliance with ASTM D 1746 is the CL–100 clarity meter from the Zebedee Corporation.

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Zebedee CL-100 Transparency Measurement